Machine-tool.



L. l. YEOMANS & G. F. BRYANT.

MACHINE T0.0L.

APPLICATION FILED Aua.26. IsIs.

1,205,588. PatenteaNov. 21,1916.'

' UNITED STATES PATENT oEEIcE.

LUCIEN I. YEOMANS, OF CHICAGO, ILLINOIS, AND.GEORGE F. BRYANT, OF PROVIDENCE, RHODE ISLAND, ASSIGNORS TO AMALGAMATED MACHINERY CORPORATION, 0F

CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK. Y

MACHINE-TOOL.

`Specification of Letters Patent.

Patented Nov. 21, 1916.

Applicationled August 26, 1915. l Serial N o. 47,389.

.vented certain new andguseful Improvements in Machine-Tools, of which the following is a specification.

y This invention relates to a unitaryl power and hand-operable means for feeding a machine tool carriage, which means is constructed so as to permit either feed to be used independently of the otherI and without disconnecting one from the other or from the carriage. Y

The object of thel invention is to provide an improved feeding means of this character in which the rotationof the driven screwthreaded element on the -carriage, is frictionally resisted so as to prevent accidental rotation of said element by its coperating power-driven element, while at the same time permitting the former element to be rotated at will by the hand-operable feeding means.

The invention is applicable to the toolholding carriages or work-holding carriages of lathes, milling machines, drilling machines, boring machines, and other machine tools. It is herein disclosed in connection with the tool-holding carriage of a lathe.

In the accompanying drawings, Figure 1 is a fragmental top plan view of a lathe embodying the features of our invention. Fig. 2 is a view taken from the right-hand side of Fig. 1. Y

In the drawings, 1 denotes a tool-holding carriage which may be of any suitable form and construction. The carriage 1 is mounted upon two parallel guides or ways 2.v

While the guides Vmay be of any suitable construction, theyare herein shown as consisting of cylindrical rods. The power feed for the carriage 1 includes a'feed shaft or lead screw 3 extendingk parallel with the ways 2 and approximately midway between said ways.

The means for connecting'the carriage 1 to the lead screw 3 comprises a nut 4 engaging said lead screw. We have herein shown tudinal movement of the nut as the traveling will be understoody that the nutmay travel.

element, although it either the screw or 'I he nutv is rotatably Ymounted within a bearing sleeve 5, said sleeve being fixed in the carriage l. Longithe nut 4 in one direction with `relation to Ithe kcarriage is prevented by means ofa collar 6 on one end of said nut. On the other end of the nut is a bevel gear 7 which constitutes a collar or ange preventing longitudinal movement in,

theopposite direction with relation to the carriage 1. The bevel gear 7 meshes at all times with a bevel pinion 8, which pinion is secured to the inner end of a shaft 9 mounted in bearings 10 and 11 on the carriage 1. To the outer end of the shaft 9 is fixed a hand-wheel 12.

When the tool carriage 1 is to'be moved by the power feed, the lead'screw 3 is set in rotation.- The leverage of the lead screw upon the nut is so slight, as compared with the resistance to rotation of the nut, that the nut remains stationary with reference to the carriage, and hence the carriage is moved forward or back, depending upon the direction of rotation of the screw. If it be desired to increase the resistance of the nut 4 against rotation, suitable means may be provided for that purpose; for example, the

bearing 11 may be made compressible, as y herein shown, and provided with a screw 13 by means of which more or less pressure may be applied'to the shaft 9. If for any reason Yit should be desirable to temporarily retard the feed of the carriage l (as when an extremely hard spot is encountered in the work), thehand-wheel 12 ymay be revolved in the direction to revolve the nut 4 rearwardly with reference to the screw 3, therebv decreasing the rate of movement imparted to the carriage by thel lead screw. If it be desirable to temporarily accelerate the power feed, as, forv example, if there be a space in the work in which there is no out to be made, the hand-wheel 12 may be revolved in the direction to feed the nut 4 forward upon the screw 3. When the lead screw 3 is at rest, the carriage 1 may be moved in either direction by rotating the handV wheel 12. It will be seen that although the nut and the screw always are in engagement, `the hand-feed may be used either alone or in conjunction with or in opposition to the power feed.

In the appended claims, we have used the word carriage to indicate a tool carriage, a work carriage,v a drill spindle or an analogous moving part of a machine tool.V

'Ve claim as our invention:

l. A machine tool having, in combination7 spaced apart guides, a Acarriage lmovalolv supported by said guides7 a lead screw and nut located intermediatey -the guides for moving ythe carriage, one of said screwthreaded elements Vheling located on the carriage, a shaft on 4the Carriage, a hand wheel on said shaft, gearing connecting the shaft to the screw-'threaded element on vthe carriage, and a split bearing inclosing said shaft and having means for variably clamping the same to rietionally resist rotation of the Shaft so as to prevent accidental ro- Copies of this patent may beY obtained for 1,2o5,5ss

tation o-t` said screw-tlneaded xelement on the carriage while :permitting rotation thereof h v said hand wheel.

2. A machine tool having, in combination, spaced apart guidesl a carriage movably supported by said guides, a lead screw and nut located intermediate vthe guides for Vvmovi-ng the carriage, one of said screw- -n testimony whereof we hereunto set our hands. Y' BUCHEN 1. YEOMANS.'

GEORGE BRYANT. 1

ve cents each, by addressing the Commissioner of VPatents,

Washington, D. C. 

